What is the effect of increasing temperature on the equilibrium?

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Apr 20th, 2015

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Apr 20th, 2015

Le Châtelier's principle states that a change in temperature, pressure, or concentration of reactants in an equilibrated system will stimulate a response
that partially off-sets the change to establish a new equilibrium. In the case of changing temperature, adding or removing of heat shifts the equilibrium.

Le Châtelier's principle explains that the reaction will proceed in such a way as to counteract the temperature change.

Exothermic reaction

2C(s)+O2(g)⇌2CO(g)+heat

In exothermic reactions, (ΔH<0) heat is released with the products.
The energy to break the bonds on the left side of the equation is lower than the amount of energy released from forming the product on the right side of the equation,
and the net difference is observed as heat on the right side of the equation.
When separated molecules join together, enough energy is released to overcompensate for the energy required to break reactant bonds.
So when the temperature is increased, the exothermic reaction will favor the reverse reaction.
whereas decreasing the temperature, will favor the forward reaction.

Incase of an endothermic reaction,(ΔH>0) and more energy is needed (heat is absorbed) to overcome the forces of attraction between molecules
and to separate them from one another (the activation energy) than the energy gained when new bonds are formed.
So when the temperature is increased, the endothermic reaction will favor the forward reaction.
whereas decreasing the temperature, will favor the reverse reaction.

heat+6CO2(g)+6H2O(l)⇌C6H12O6(aq)+6O2(g)

Apr 20th, 2015

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